Crossword Genius

Days leading up to the next sign, in astrology (4)

Ross

I believe the answer is:

cusp

(Other definitions for cusp that I've seen before include "Point formed by two intersecting curves - point of transition" , "Prominence on a tooth" , "Pointed end where two curves meet" , "Pointed end (e.g. on tooth)" , "Either point of a crescent moon" .)

I've seen this clue in The New York Times.
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